Ments



A. LATHAM. CUTTER Gmnm DEVICE. APPLICATION FVILED FEB. 245 19H5 Patented July 1, 1919'.

ITEn sTATEs PATENT OEEICE.

ALBERT LATHAM, OE BEVERLY, MASSACHUSETTS, AssIsfNoR,` BY MEsNE ASSIGN- MENTS, `To .UNITED sHOE MACHINERY CORPORATION, OE PATERsON, NEW JERSEY, A CORPORATION or NEW JERsEY.`

CUTTER-GRINDING- DEVICE.

incense. i

Application sied rbruaryeaisic. seriaiirasoeva y To all whom t may concern:

Be it known that I, ALBERT LATI-IAM, a citizen of the United` States, residing at Beverly, in ithe county of Essex and `State-` Of Massachusetts, have invented certainlml` provements in Cutter-Grinding Devices, ofi which the following description, coiine`c- I tion with the accompanying drawings,7is a specification, like reference characters on the 1 drawings indicating like parts in the'several figures. f y

This invention relates'to devices for grind ing or sharpening the teeth of rotary cutters such as are used, foreXample, for trimming the edges of soles in the manufacture of boots and shoes; and an 'object'of theinvea tion is to provide a device .off this character in the use of which the proper relative locations of the cutter and the grinding member j may be accurately determined and the posi-i` `tion of the cutter readily controlledso as to insure accurate grinding ofthe teeth.

In a more particular aspect, an important object of the invention is to provide a devicefl s A stantially with the end of the cutting edge of af tooth at the smallerend ofthe cutter .when the tooth is in position to beground, f thus permitting angular adjustment ofthe forms an acute angle with the. plane ofthe cutter, i. c. a plane perpendicular tothe aXis of the cutter, or is angularly disposed with` reference to the axis of the cutter, such, for

example, as the cutter shown and described in my prior Patent No. 1,104C,910,granted July 28, 1914i. In cutters of the typeshown in said patent the proper angle between the front face of each tooth and the plane of the` cutter `depends principally upon the difference between the diameters of the opposite ends of the cutter, and consequently in cutters of different shapes, involving substantial variation inthe difference between the diameters ofthe opposite ends, there `is a corresponding variation in the` angle formed bly the plane of the front` face of the tooth and the `plane of the cutter.` -It is accordin gly a particular object of this invention to 3 in the claims.

Specification of 1'..etters` Patent.

Patented July 1, 1919.

feature of the invention consists in the combination of a grinding member and cutter positioning means constructed and arranged to facilitate relative adjustment for varying the angle between the plane of the grinding i member and the lplane in which the cutter is held or between the plane ofthe grinding member and the axis of the cutter. In cutters of the type shown in my prior patent, different cutters may 'present differences in diameterat their larger ends, involving differences inthe angle between the plane of the front face ofthe tooth and the plane of the cutter, butthey are uniform in shape and diameter at their smallerl ends, *and in the different cutters the line of intersection of the plane ofthe front face of la tooth and the plane of the smaller end face of the cutter on which the end of the cuttingedge of the tooth at the smaller end of the cutterlies, is at a uniform distance from the anis of the cutter. Accordingly the construction herein shown comprises provision for adjustment of `the cutter support about an axis coinciding subcutter support for grinding differently shaped cutters without necessitatingother adjustment in order to present the teeth of different cutters in proper `relation to the grinding member. j

Arpfurther feature of the invention consists in improved means for determining successivepositions of acutter as it is ro- ,.tated tofpresentA different teeth in position for grinding,` constructed to facilitate adjustment for varying thepoint of angular advance of the cutter teeth.

The above and otlier'objets and features of the invention, including certain novel details of construction and combinations of parts, will nowbe described with reference to the accompanying drawings and pointed out In the drawings, Figurel is a view in rear elevation of mechanism `in which the invention is embodied, a portion of the mechanism being `broken away to` illustrate the interior cons i,

screw should be tightened sufficiently to prevent accidental displacement of the holder 62 while permitting the operator to turn the holder about the sleeve and thus adjust the position of the dog 60 whenever desired without the necessity `of loosening the screw. A leather washer 68 between the head of the screw 66 and the holder 62 insures a slightly yielding engagement between the holder and the sleeve. The dog 60 may thus be readily of the wheel with the front face of a cutter r tooth. A stop 70 threaded in a bar 72 which is clamped to the block 14 serves by engagement with the bracket 30 to determine adjustably the limit of movement of thel cutter toward the wheel, thus preventing the wheel from engaging too deeply between the teeth of the cutter.

As previously explained, it is an important object of the invention to provide means for grinding cutters of different shapes, in`- volving a variation in the angle between the plane of the cutter and the plane of the sur`` face of the tooth to be ground, such that the adjustment for the different cutters may be ble. To this end the curve of the guideway 36 is anarcof a circle whose center is ,indior lies in the plane ofthe grinding face of the wheel`6, this linethus constituting the*` axis of adjusting movement of the holder-w38 and the spindle 44. Adjustment of the holder 38 in the guideway 36, therefore,`

while varying the angular relation between the plane 1n which the cutter 1s positioned and the plane of the grinding member, will` not vary the location of that portion "of the r cutter which is on saidfaXis, and since, as hereinbefore explained, in cutters of the type` shown in my prior patent "the line of in tcrsection of the two planes above `referred tois at the same `distance/freni vand offset from the "axis of the cutter in cutters" of difment necessary in changing from a cutter of one shape to a'cutter of a different shape is adjustment `of the holder 38 along the guideway`36.

In order to facilitate accurate adjustment of theholder 38, the bracket 30 is provided with a scale, as shown in Fig. 2, graduated in degrees corresponding ,to different degrees of angularity between the aXes and the planes of the front faces of the teeth of different cutters, and the holder 38 is provided with a pointer to cooperate with the marks on thescale. In the position shown in the drawings the holder and spindle are set for grinding 15 degree cutters; and since the greater number of cutters of the type referred to which are at present in demand for trimming the shanls of shoes are of a shape requiring substantially this degree of angularity of the front surfaces of the teeth, thedevice is further provided with a pin 7 4 positioned in registering bores in the holder 38 Y and the bracket 30. This pin insures against accidental displacement of the holder 38, and is useful where the cutters to be ground are of uniform shape and the holder 38 is to remainfor a long time in the same position. When cutters of other shapes are to be ground, the pin 7 4 is of course ren'ioved. Ordinarily the `clamping screw 4() is depended upon and is sufficient to retain the `holder in position. It willbe apparent that by positioning the holder with the pointer opposite to the Zero mark the device may be adjusted to grind cutters in which the front face ofthe tooth is parallel to the axis of the cutter; accomplished as speedily and easily .as possi- `In the operation of the device, a cutter is first clamped upon the end of the spindle 44 by means of the screw `50, with that face of the cutter at the smaller end of the bore in engagement with the end of the spindle.

Preliminary adjustments may then be made, r

. if necessary, to change the location of the cutter support with reference to the wheel, as by sliding the block 14 on the guideway 12, after loosening the screw 20,in order to adjust thesupport transversely of the axis ofthe grinder shaft 4, or by sliding the sleeve 26 lengthwise in its holder to adjust the cutter: `support longitudinally` of the grinder shaft. If the holder 38 is not al-` `ready positioned `at thevproper angle for grinding" the cutter in question, it should be adjusted along the guideway 36 and clamped in proper position by the screw 40.

Before the rotation of the grinding wheel is started, `the cuttersupport should be swung i `to carry the cutter approximately to grindu ing position, and if the dog 60 is' not so po- 125` in parallel relation to the grindingface of Sthe wheel, the dog should be adjusted by ferent shapes,:it follows that the only adjust- Power is' new applied tolrotate the. Wheel 62,. and' the cutter' support isf swung to: carry the' cutter toward the Wheel and. cause-thezwheel to operate upon the front face of the. tooth; During the grinding of. a tootlr the spindie 4:4 is held by the operator, by the miliedf.

` ground. 'Ehe support is: then swung; to-

ycarry the cutter away from kthe grinding memberl and the spindle turned toi position the dog 60? in: the4 next notch of the series, thus bringing* the' next tooth into' position for grinding. .In thisimanner the teeth of the eutter may be ground to ai uniformextent It it should then be necessary togrind the teeth furtherin order to form sharp cutting edges, the holder' 69; with the dog (50" may' be turned to: permit a slight angular advance of the cutter, after which the several teeth may be groimdi as before. Iii the teeth are toI bei ground to any conside erable depth, however", it' is preferable to change the position ot the cutterv longitudinal'ly of the shaft 4L byl adjusting the sleeve 26 in its holelfer'lt, in:u order to.= avoid changing materially' the pitch` ot the: teeth..

Although in the construction herein show-n the critter is positioned with its lari-ger end uppermost and' the. axisy about Which; the cutter support is adjustect consequently lies substantiallyy in the'. plane of' the lower end face ot the cutter as thus. positioned, it should be understood'that the feature of the invention'- comprising provision Yfor adjustment of the cutterr support about an axis; disposed as hereinbefore described withl rei-Y erence to the'eutter is not dependent upon thev location of the cutter in the particular position showmand that as far as this feature of the invention broadly is concerned the cutter may be variously disposed with reference' to its support.. rPhe illustrated' construction insures that' the end face of the cutter in which the axis of adjustingmovement oiithesupport should lie shall always be positioned in the same plane throughthe provision of' means for engaging and posi.- tioningthis face of the cutter, but it Willfbe obvious that various means maybe employed' for insuring'the properlocation of different cutters with reference to the axis ofV vadj usting movement ofk the support irrespective of Which end of the cutter is tobe lpositioned uppermost. As to other features,

also, it should be understood that various specific embodiments of the invention are comprehended Within the scope of the claims.v It Will be apparent, moreover', that mechanism in which the invention is' embodied is not limited to the grinding ocut-V for grinding cuttersVV of variousl forms and for'y various uses.` y

l-:lavingv described-V theinvention What I' claim as new and desireitofsecure by Letters Patent ot the United States isf:-

li.. A device fior' grinding' rotary toothed cutters comprising,` in combination2 a grinding member andv a cutter positioning member relatively movable to, effect alternate engagement and disengagement oi'- the grindingmember' and thefront face of a tooth to be ground, said members being relatively adjustable about an axis coinciding substantially withl the line of intersection oi the plan-e oit one end face of the cutter andi the plane oit the front face of a tooth when the tooth is: in position to be ground.

2. A device for grinding rotary toothed cuttersI oit diidierent diameters at their opposite end-s' comprising, in combination, a grinding member,` and: a cutter supporting member constructed to position a cutter With its smaller end face in a predetermined location with reference to saidv sup-porting member, said members being' relatively adjustable about an axis lying substantially at the smaller end face of the cutter as thus positioned.

A device for grinding rotary toothed cutters comprising, in combination, a grinding member, and a cutter supporting mem- Ibery constructed and arranged to position different cutters with their corresponding endl faces in substantially the same location with reference to said supporting member, said' members being relatively movable to eil'ect alternate engagement and disengagement oi" the grinding member and the surface of a tooth to: be ground and relatively adjustable about an axis coinciding substan- A tiallyivith the end ot' the cutting edge of aI "of the grinding member and the plane in which the cutter is presented Without varying the location of that portion of the cutter which is on said axis..

4. A device for grinding rotary toothed cutters in which the line of intersection of the plane of one endy face of the cutter and the plane of the front face of a tooth of' the cutter is` at the same distance from the axis of the cutter in cutters of different shapes, comprising, in combination, a grinding member, and a cutter supporting member constructed and arranged to position difieren-t cutters with said corresponding end faces in substantially the same plane with reference to said supporting member, said members being relatively adjustable about an axis coinciding substantially with said line of intersection With reference to a tooth when the tooth is'in position to be ground.

5. A device for grinding rotary toothed cutters comprising, in combination, a grindlmembers being relatively adjustable about an axis coinciding substantially With one end of the cutting edge of a tooth of the cutter when said tooth is in position to be ground. v l

6. A device for grinding rotary toothed cutters comprising, in combination, a grind ing member, and a member for positioningV a cutter for the grinding operation, said members being relatively adjustable about an axis lying at one` side of the axis of a cutter and substantially in the plane of one of the end faces of the cutter as thus positioned. .7. A device for grinding rotary toothed cutters in` which the plane of the front face of the cutter tooth is disposed indifferent cutters at dilferent angles to the cutter axis but includes a `locus positioned in uniform relation to but offset from the cutter axis in .the different cutters, comprising, in combination, a grinding member and a cutter positioning hmember, said members -being relatively `adjustable about an axis which coincidesvvith such a locus of a cutter tooth when 4said toothv is in position to be ground.

A8. In a device for grindingrotary toothed cutters, the combination With a `grinding member, of `a cutter support movable to carry a cutter toward or from said member, said support being adjustable about an axis substantially parallel to the cutter engaging .face of the grinding member and coinciding substantially with one end ofthe cutting edge of a tooth When said tooth is in position to be ground. j

9. In a device for grinding rotary toothed cutters in which the line of intersection of the plane of one end face of the cutter and the plane of the front face of a tooth of the cutter is at the same distance from the axis of the cutter in cutters of different shapes, the combination with a grinding member, of

a cutter support constructed and arranged structed and arranged to position a cutterV forthe grinding operation with the smaller end face of thecutter in a predetermined plane With reference to the support, said support being adjustable about an axis coincidingsubstantially with the end of the cutting edge `of a tooth at said end of the cutter when said tooth is in position to be ground in order to vary the angular relation between the plane of the grinding member and the plane in Which the cutter is presented Without varying the location of that portion of the cutter Whichis on said axis.

11. In a device for grinding rotary toothed cutters in which the plane of the front face of the cutter tooth is disposed in different cutters at different angles to the cutter axis but includes a locus positioned in uniform relation to the cutter axis and substantially at one end of the cutter in the `different cutters, the combination with a grinding member, of cutter positioning means adjustable `about an axis which coincides substantially with such a locus of a cutter tooth when said tooth is in position to be ground.

12. In a device for grinding rotary toothed cutters, the combination with a grinding member, of cutter positioning lneans mounted for oscillatory movement to carry a cutter into or out of position to be ground, said means comprising parts relativelyadjustable about an axis coinciding substantially With one end of the cutting edge of a tooth of the cutter when said tooth is in position to be ground to vary the angular relation between the plane of the cutter and the plane of the grinding member.

`13. In a device for grinding rotary toothed cutters, the combination With a grinding member, `of -cutter positioning` means `comprising a member mounted for oscillatory movement in` a plane substan tially parallel to the plane of the grinding member, and a cutter supporting spindle mounted on said oscillatory member and adjustable relatively thereto transversely of the direction of oscillation to vary the angular relation between the plane of the cutter andthe plane of the grinding member, said oscillatory `member .having a guideway curved about an axis coinciding substa`n tially with the location of a cutter on said spindle to determine the adjusted position of the spindle.

lit. In i a :device for grinding rotary toothed cutters, the combination with a grinding member, of a cutter supporting spindle rotatable to position the teeth of a cutter successively for grinding, said spindle being adjustable transversely to the plane of the grinding member to vary the angular relation between the plane of the grinding member and the plane in which the cutter is presented, and means for `determining successive positions in the rotation'of the spindle, said means being adjustable with the spindle.

`15. In a device for grinding .rotary toothed cutters, the combination With a grinding member, of cutter positioning means mounted for oscillatorymovement to carryacutter into or out of position to be ground, said means comprising a cutter support adjustable in different angular relations to the plane of oscillation of said Ymeans aboutanaxis offset "from the aXis of the cutter.

' 16. In 'a device for grinding rotary 'toothed cutters, the combination With a grinding member, of cutter positioning means mounted for oscillatory movement to carry a cutter into or out of position to be ground, said means comprising` a cutter support adjustable -in different angular rela.-

Y tions to the plane of oscillation of said means about an aXis coinciding substantially With vone end face of a cutter on said support.

17. ln a device for grinding rotary Vtoothed cutters, the combination With a grinding member, `of cutter positioning means mounted for oscillatory movementto carry,a cutter 'into or out oi position to-be ground, 'said means comprising a cutter supporting spindle constructed "to position a cutter by engagement Wi'tli'an end face olf the cutter, said spindle being adjiistaible in different angular 'relations to tlie'planeY o't oscillation of said means about an aXis positioned ysubsta'n'tiall'y'at said end face of the cutter. v

v18. In ya device `for grinding trotary toothed cutters, vthe lcombination With a grinding member, of a cutter support rotatable to position the teethof a cutter successively' fior4 grinding, and means for determi-ning successive positions in the rotation oli said support, said meansl comprising a positioning member frictionally held to permit its adjustment about the aXis of ysaid support in response to unusual pressure.

19. In a device for grinding rotary toothed cutters, the combination With a grinding member, of a cutter support rotatable to positionthe teeth of acu-tter successively yfor grinding, and 'means 'for determining `successive 'positions in the rotation oi said support, said 'means comprising` a member encircling lthe a'Xis of Ithe support and having depressions cor-responding to the number of the teeth of the cutter and a member constructed to enter said depressions in succession to position 'the support, one -o't said members lbeing rotatable With the support, and frictional meansl for restraining the other member normally from rotation 'about the aXis of the support vvliile permitting it to ybe adjusted about said axis in response to unusual pressure.

a -device for .grinding rotary toothed cutters, the combination With a grinding member, of a cutter supporting spindle rotatable to position the teeth oiE a cutter successively for grinding, a sleeve in which said spindle is mounted, a notched Wheel on the spindle at one end. of the sleeve, a dog-arranged vto engage the notches oi said `Wheel fto determine successive 'positions oit' Y nsdsst `the spindle, and a ysupport for the dog yieldlingly clamped to said sleeve to permit adjustment about the aXis of tlie spindle in respense to unusual pressure.

21. In a device tor grinding rotary cutters having tapering bores, the combination With a grinding member, of cutter supportin'g member, yand means for determining with a grinding member, o "a cutter support having a surface formed for engagement with the end tace of a cutter at the smaller 'end or the bore, and a screw for clamping the cutter upon said surface, said screw having a straight portion of substantially the v,same 'W'idtli as 'the smaller end of said bore "and a substantially 'irusto-conical portion kconstructed to engage the cutter at the ylarger end of the lbore ,in Aacute angular relation .to the surface oi the bore.

23. ln `a device lfor grinding cutters having tapering bores, `the combi-nation with a grinding member, of a cutter-supporting member, and means `for detern'iining the position of the cutter upon the supporting member, said means having portions movable vtogether as a unit, one of tlie portions substantially fitting the smaller end lof the vc'utter vbore and another portion being inclined to engage the opposite eXtrem-ity of the bore. y n 24. In a device for grinding cut'teislhaving tapering bores, the combination With a Vgrinding member, of a cutter-supporting -mem'ber, and means for determining the po sition of r'the cutter upon the supporting member, said Ameans having `portions movable together as a unit, one of the portions substantially -fitting the smaller end ot the cutter bore and another portion being inclined at a different angle lfrom that ot lthe bore and engaging the larger extremity thereof. Q5. In `a Vdevice for grinding cutters having tapering bores, 'tlie combination with a grinding member, of a spindle provided with an end surface against which the cutter operated upon may rest, and a screw threaded into the spindle and lia-ving a shank substantially fitting the smaller end of the cutter bore and a lfrusto-conical shoulder -for engagement with the larger eX- tremity of the bore. l

ln testimony whereof I have signed -mv name to this specification. l

ALBERT LATHAM.

U'opiesrpl this patentmay be obtained for've cents each,'byaddre'ssing the Commissioner of Patents,

' Washington, D. G. 

